Furnace-feeding device



(10 ModeL-)5- v 2 -S-heets-Shee't 1.

\ R. W. DREW.

FU-RNAGE FEEDING DEVICE. No. 247,469. Patented Sept. 20,1881.

. l: 'im i '(No'Mode'l.) 2 Sheets-Sheet 2.

' R. WQ DREW.

FURNAGB PEEDING DEVICE. No.. 247,469, Patentedsept. 20,1881.

W2! e es. .Zinn-zahn REUBEN w. DREW, or CLEVELAND, OHIO.

FURNACE-FE/EDING DEVICE.

' SPECIFICATION forming' part of Letters Patent No. 247,469,

Application led January 12, 1881. (No model.)

dated. septembe 2o, 1881,.' l

.To all whom it may concern:

Be it known vthat I, REUBEN W. DREW, of

Cleveland, county of- Cuyahoga, State of Ohio,

have invented certain new and useful Improvethefollowing is a specification.

My invention relates -to improvements in apparatus for mixing currents of steam with currents of air and introducing the same when dame-chamber of It also consists in the combinathoroughly mixed into the the furnace.

' tion and arrangements of the several parts or elements hereinafter particularly described.A

The objects of my invention are to produce means for causing steam and air to become thoroughly mixed and discharged in diffusive subdivided streams `or currents into the flamechamber of furnaces for the better and more perfect combustion of the combustible gaseous products evolved from the top surface of the fuel, which heretofore escaped unconsumed;

, also for adjusting and regulating' the proportions of steam and air to be mixed andv jointly introduced into the dame-chamber of the furtional view taken at line 6 is a side elevation of the gaging-pin audits gaging-groove. Fig. 7 is a cross-sectional view nace, so as to better adapt the apparatus for use with any of the various kinds of fuel employed for combustion in furnaces. I' attain these objects by means ofthe mechanism illustrated in the accompanying drawings, in

Figure 1 represents a sectional elevation ot' the apparatus, except the blower. Fig. 2is a plan view of the face of the spreader. Fig. 3 is a cross-sectional view taken atline .N 0.1Yin Fig. 1. Fig. 4 is a cross-sectional view taken at line No.2 i-n Fig. 1.

No. 3in Fig. 1. Fig.

of the gagingpin,taken at line No.4 in Fig. 1. Fig. 8 'is a side elevation of the apparatus, illustrating the same in positionand in connection with thefurnace.

Similar letters refer to similar parts throughout the severalyiews. In the drawings, 4A represents a section of the furnace of. a boiler, .and A is the heated portionofthe same, to which my improved apparatus is attached, as shown in Fig. 8.

B is a shell-form bracket, which bracket is secured in connection with the furnace at a said bracket holds and supports the operating ments 1n Furnace-Feeding Devices, of which Fig. 5 is a cross-sec` lopening 1s closed pipe; Fitting in the said as shown in Fig. 7.

point above the upper planeof the upper surface of the fuel on the'grat'e of the same by means of a short screw-connection pipe. The

parts of my improved apparatus, and. is provided withV an interior chamber, B', made, preferably, in a spherical form. The upper side of this chamber is closed by the screwj cap or plug The rear side of said chamber is provided with opening a, which communicates through the screw-connection pipe b with the combustion-chamber of furnace A. Made opposite of opening a is opening a', closed by screw-plug D, which screw -plng terminatesl with a steam-pipe, D', which pipe holds and supports some of the operating parts'of my improved device within chamber B'. Made in the lower side of bracket B is opening 112,' l

the mouth ot' which is provided with a screwthread for connecting the said bracket auditsI chamber B withthe air-tube E, whch'airtube connects with a blower, E'. The screw-plugD is recessed in its front end and provided with a screw-thread, c, for conA vided with a screw-thread a steam-pipe, G, connecting with the boiler said chamber. e is opening c', providedwith a screw-thread for connection with a blow-cock, HJ Connecting with the rear side of the said steam-chamber is opening e?, and with-tlhe front' side of said chamber is the opening e3, which latterI with screw-plug I.

The steam-pipe D', attached to screw-plug D, is extended rearward from opening a abouth `centrally through chamber. B. to ashort distance from the'throat of opening a, as shown in Fig. 1. The rear end of said steam-pipe is made with a funnelshaped end opening, m,

which connects with the bore f of said steamp funnel-,shapedopening m is the steam-spreading'plug M, which plug is made conical to correSPQnd .with said funnel end opening, and is furnished ,with a series of grooves, n n, running in spiral direcnecting bracket F with bracket B. The said bracket F contains the steam-chamber F,-' which chamber has an opening, c, above, prov.-

for connectionwith '8b r. (not shown) for the introduction of steam tu Placed opposite said open'ngr;

tions from the apex of saidplug to its baie Y;

The small end of the 4 from the extreme end ot' said gaging-pin about ,The said bore f' is provided with ascrewcone-plug M is made to terminate in a cylindrical nib, n', provided, with a screw-thread, which nib screws into a corresponding screwthread cutjn the bore f of the steam-pipe D', and holds the said conical plug in secure connection with the funnel end m ot' the said steam-pipe.- 'Grooves n are`formed in the periphery of the screw-threaded nib n' for con. nection of the chamber B' with the bore f ofl the steam-pipe D. The funnel end m of said steam-pipe, together with the conical plug M', provided with grooves n, form whatI denominate the steam-spreader.

Projecting rearward from the base of the conical plug M is the spindle N, on which freely revolves a fan-draft wheel, 0, which wheel sets in the throat of opening a, as shown in Fig. 1. y

The rear end of the plug D is centrally pierced iu direction of its length,and in a line coincident with the axis of the bore f of steam-pipe D', with a bore, f', of smaller diameter than that of bore f, so as to form a connection of said steam-pipe with the steam-chamber F'.

thread, s., y

The screw-plug I of the steam-chamber F' is centrally pierced in a line of direction/coincident with the line of direction of theqewthreaded boref made in the screw-plug Passing through the pierced pl-ug I, and centrally through the steam chamber F', and screwing into the screw-threaded bore f' is the steam-gaging pin P, provided with a iin gerwheel, P', by which said gaging-pin may be operated, so as to be screwed to any distance into boref', as may be selected. Cut into one of the sides of the said gaging-pin and into its screw-threaded end portion is a gaging groove or recess, q, made, preferably, with V-shaped form of sides from the periphery of said pin, and with a gradually-tapering form in direction of its length, with the base or wide end of the groove terminating in the plane groove q', made in the end portion of the gaging-pin, and at its point or apex terminating at a distance equal to the length of the screw-threaded bore, into which the said pin works. A stuing-box may be made with plug 1, so as to make the joint of the gaging-l'in with said plug steam-` tight. The screw-thread s of bore f' and the screw-thread of the said gaging-pin working in` said screw-threaded bore may be omitted, and a screw-thread out on the gaging-pin at its linger-wheel end and working intoA a screwthreaded hole made in the plug may be substituted.

The manner-in which the several parts of my improved apparatus for mixing and forcing air and steam into furnaces operate is as follows: One or aseries-ot' the said apparatuses are attached to the furnace to be supplied with mixed air and steam',-according to the'size of the furnace and the capacity of the apparatus. The

and the steam-pipe G is connected with the boiler, when the apparatus is ready for operation. -Before the steam is permitted to escape from chamber F' into chamber B the communication between said chambers is to be temporarily closed by screwing the gaging-piu P inward, when'tlle operator will turn the key of blow-cock H so as to discharge the waste-water and sediment which may have accumulated within the said steam-chamber and the steam pipe. The blow-cock will then be closed, and the gaging-pin will be screwed outward, so that the gaging-groveqiu said gaging-pin willhave a portion ot its length drawn back into the throat e of steam-chamber F', so that said groove will afford a free communication between the bore f of pipe D and chamber F' for the passage ot' steam from the latter to the for mer. When it is selected to have a greater quantity of steam admitted the gaging-pin will be turned outward, so as to draw the widest portion of the gaging-groove q to the throat e of chamber F; and when a less quantity of steam is to be employed the said pin will turn in, so that the more contracted portion of the groove will be at the said throat, and accordingly as the area of said gaging-groove'in its the throat of the steam-chamber the quantity of steam admitted to bore f will be increased or lessened. 'Bhe bore f of pipe D' conducts the steam to the spreader M m, and, entering M, will escapeinto chamberB'. The said steamspreader, by reason of its conical form, operates tocause the currentofsteam to escapeintochamber B in lines of direction at an angle with the line of direction of the bore j) or, in other words, the current of steam will be uade to be funnel pasted and sold, as heretofore produced. By means ot' the grooves n made with the spreader the steam is' made to escape into chamber B' in numerous small streams or currents, moving with high velocity in lines of direction which will be divergent in their character, and by forming the said grooves spiral yeach of the streams will be made to become not only di vergent in their character, but will be made to twirl more or less in their escape into said chamber. The steam escapingfrom the spreader enters into the throat a of the chamber B' with great velocity, and drives before it the air'tha't may be in front, and tends to create a vacuum in the air-pipe E, and the pressure of the outside atmosphere'will force the air .forward 'in said pipe to replace the air in chamber B as it is being expelled by the force of 1 the currents of steam from the spreader. The

will strike the fans of the revolving 'draft'or `outlet wheel O and cause said wheel to revolve with high velocity, and together pa'ss into the throat of the dischargeopenin g a, through the 'spaces between the fans of said wheel. The

air-conductor E is`connected with the blower,

enlargedor contracted portions are brought to the spiral grooves n, made with the conical plug v shape or conical and diffusive instead of com- TIO steam-current and the air-current together 'said wheel,freely revolving within the said discharge-opening, offers no impediment to the passage of. the steam and a1 mingled steam and air to have its several points of entrance continuously changing in a rotating manner, so as to give to the currenta twirling movement, which will thoroughly mix the steam and air in a manner not heretofore practiced. The fan blower E will exert a pressure on the air in the air-supply pipe E, and will` force a blast of air into the mixingchamberB', and thedi'scharge-opening' a, being of smaller capacity than that of the said airsupply pipe, will somewhat check the free'escape of the air from said mixing-chamber, and thereby cause the air within the same lto be more dense than it would be if the dischargeopening were ofthe same capacity, so that when the steam is discharged forward it will carry with it a larger quantity of air than is possible without the employment of the blower.

When it is desired to cause air to be introduced in greater excess of steam the operator will setthe gaging-pin P inward to a point which will reduce the volume of steam to be. discharged' into the mixer,

while, when it is desired to have the stealn'largely in excess vof the air, the gaging-pin P will be drawn back vso as to enlarge the opening'for the passage of the steam from the steam-chamber, while at the same time the fan-blower will be made to operate with less'force, or may be wholly stopped. In the' latter case the air will be drawn through the air-supply pipe into the mixing-chamber by the draft caused by the discharge of the steam into the discharge-opening of said chamber.- v It will be readily observed that by my improvements proportions of steam and air mingled together and discharged into the Hamechamber of the furnace can be readily and nicely adjusted and regulated. g

It will also be readily observed that the steam will be made to havea diffused discharge into the mixing-chamber insteadof a concentrated discharge, as heretofore, and that the escape of the steam into the said chamber will r escaping through the spaces of the fan-wheel, while the said spaces will be quickly rotated and cause the land a pipe, D,connecting the two,

be in small streams or currents which are divergent in their character, and also have given to them, or each of them, a direction of movement which willbe more or less spiral in its nature, while the revolving spaces or escape- 'openings in fan will give to the current of mixed steam andV air a twirl which will com- 5 5 vplete the mixing of 'the said two elements beforetheir inal discharge into the flame-chamber of the furnace.

To render the steam-pipe D capable of being extended in its length so as 4to canse the 6o discharge end ofthe spreader to be adjusted to any point nearer to the throat of the opening a of the mixing-chamber, the pipe D' is made sectional and the sections are held in connectionby means of sleeve D2, as shown in Fig. 1, and set-screws or screw-threads cut on the neighboring ends of the sections of, pipe D and in the bore of the sleeve may be employed.

Havingdescribed myinvention,whatIclaim, and desire to secure by Letters Patent, is-4 1. In a furnace-feeding device, vthe combination, with a mixing-chamber, air-supply pipe, and steam-supply pipe, of a steam-spreader and a revolvingoutlet-wheel set into the throat of the discharge-opening of said mixingfchamber, for the purpose set forth.

2. In a furnace-feeding device, the combination, with a mixing-chamber, air-supply pipe,

and steam-supply pipe, .of a spreaderformed by the conical end opening, m, and conical plug M, having a space or spaces between for the escape ofthe steam thus spread into the mixing-chamber, and a revolving outlet-wheel'in the discharge-throat, as and for the purposes set forth. v I j 3. In a furnace-feeding device, the combination, with amixingchamber,a steam-chamber, of a gaging device .for regulating the quantity of steam let into said pipe D', and the spreader Mm n, for diverging or spreading the same in the mixing-chamber, as set forth.

REUBEN W. DREW. Witnesses:

CHARLES SELKIRK, V'RICHARD P. D UMARY. 

